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Steel Making

High-chromium Or Rust-proof Steel
High-chromium, or what is called stainless steel containing f...

The Effect Of Tempering On Water-quenched Gages
The following information has been supplied by Automatic and ...

Instructions For Working High-speed Steel
Owing to the wide variations in the composition of high-speed...

A Chromium-cobalt Steel
The Latrobe Steel Company make a high-speed steel without tun...

High-carbon Machinery Steel
The carbon content of this steel is above 30 points and is ha...

Heat Treatment Of Lathe Planer And Similar Tools
FIRE.--For these tools a good fire is one made of hard foundr...

Hardening Carbon Steel For Tools
For years the toolmaker had full sway in regard to make of st...

Annealing Method
Forgings which are too hard to machine are put in pots with ...

Machineability
Reheating for machine ability was done at 100 deg. less than ...

Corrosion
This steel like any other steel when distorted by cold worki...

Shrinking And Enlarging Work
Steel can be shrunk or enlarged by proper heating and cooling...

Ebbw Vale And The Bessemer Process
After his British Association address in August 1856, Besseme...

Temperature For Annealing
Theoretically, annealing should be accomplished at a tempera...

Rate Of Cooling
At the option of the manufacturer, the above treatment of gea...

Correction For Cold-junction Errors
The voltage generated by a thermo-couple of an electric pyrom...

Phosphorus
PHOSPHORUS is an element (symbol P) which enters the metal fr...

Heavy Forging Practice
In heavy forging practice where the metal is being worked at...

Steel Before The 1850's
In spite of a rapid increase in the use of machines and the ...

Tool Or Crucible Steel
Crucible steel can be annealed either in muffled furnace or b...

Chromium
Chromium when alloyed with steel, has the characteristic func...



An Automatic Temperature Control Pyrometer






Category: PYROMETRY AND PYROMETERS

Automatic temperature control instruments are similar to the Brown
indicating high resistance pyrometer with the exception that the
pointer is depressed at intervals of every 10 sec. upon contact-making
devices. No current passes through the pointer which simply depresses
the upper contact device tipped with platinum, which in turn comes
in contact with the lower contact device, platinum-tipped, and the
circuit is completed through these two contacts. The current is very
small, about 1/10 amp., as it is only necessary to operate the relay
which in turn operates the switch or valve. A small motor is used to
depress the pointer at regular intervals. The contact-making device
is adjustable throughout the scale range of the instrument, and an
index pointer indicates the point on the instrument at which the
temperature is being controlled. The space between the two contacts
on the high and low side, separated by insulating material, is
equivalent to 1 per cent of the scale range. A control of temperature
is therefore possible within 1 per cent of the total scale range.
Figure 131 shows this attached to a small furnace.





Next: Pyrometers For Molten Metal

Previous: Brown Automatic Signaling Pyrometer



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